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      Ajax Status请求状态
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        <p>　　这篇文章主要介绍了各类Http请求状态(status)及其含义。<br>　　需要的朋友可以过来参考下，希望对大家有所帮助。Web服务器响应浏览器或其他客户程序的请求时，其应答一般由以下几个部分组成：一个状态行，几个应答头，一个空行，内容文档。下面是一个最简单的应答   ：<br>状态行包含HTTP版本、状态代码、与状态代码对应的简短说明信息。<br><a id="more"></a><br>　　在大多数情况下，除了Content-Type之外的所有应答头都是可选的。但Content-Type是必需的，它描述的是后面文档的MIME类型。虽然大多数应答都包含一个文档，但也有一些不包含，例如对HEAD请求的应答永远不会附带文档。有许多状态代码实际上用来标识一次失败的请求，这些应答也不包含文档（或只包含一个简短的错误信息说明）。<br>当用户试图通过 HTTP 访问一台正在运行 Internet 信息服务 (IIS) 的服务器上的内容时，IIS 返回一个表示该请求的状态的数字代码。状态代码可以指明具体请求是否已成功，还可以揭示请求失败的确切原因。</p>
<h2 id="1xx-信息提示"><a href="#1xx-信息提示" class="headerlink" title="1xx - 信息提示"></a>1xx - 信息提示</h2><figure class="highlight lsl"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">这些状态代码表示临时的响应。客户端在收到常规响应之前，应准备接收一个或多个 <span class="number">1</span>xx 响应。 </div><div class="line"><span class="number">100</span> - Continue 初始的请求已经接受，客户应当继续发送请求的其余部分。（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">101</span> - Switching Protocols 服务器将遵从客户的请求转换到另外一种协议（HTTP <span class="number">1.1</span>新）</div></pre></td></tr></table></figure>
<h2 id="2xx-成功"><a href="#2xx-成功" class="headerlink" title="2xx - 成功"></a>2xx - 成功</h2><figure class="highlight lsl"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line">这类状态代码表明服务器成功地接受了客户端请求。</div><div class="line"><span class="number">200</span> - OK 一切正常，对GET和POST请求的应答文档跟在后面。 </div><div class="line"><span class="number">201</span> - Created 服务器已经创建了文档，Location头给出了它的URL。 </div><div class="line"><span class="number">202</span> - Accepted 已经接受请求，但处理尚未完成。 </div><div class="line"><span class="number">203</span> - Non-Authoritative Information 文档已经正常地返回，但一些应答头可能不正确，因为使用的是文档的拷贝，非权威性信息（HTTP <span class="number">1.1</span>新）。</div><div class="line"><span class="number">204</span> - No Content 没有新文档，浏览器应该继续显示原来的文档。如果用户定期地刷新页面，而Servlet可以确定用户文档足够新，这个状态代码是很有用的。 </div><div class="line"><span class="number">205</span> - Reset Content 没有新的内容，但浏览器应该重置它所显示的内容。用来强制浏览器清除表单输入内容（HTTP <span class="number">1.1</span>新）。 </div><div class="line"><span class="number">206</span> - Partial Content 客户发送了一个带有Range头的GET请求，服务器完成了它（HTTP <span class="number">1.1</span>新）。</div></pre></td></tr></table></figure>
<h2 id="3xx-重定向"><a href="#3xx-重定向" class="headerlink" title="3xx - 重定向"></a>3xx - 重定向</h2><figure class="highlight armasm"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line">客户端浏览器必须采取更多操作来实现请求。例如，浏览器可能不得不请求服务器上的不同的页面，或通过代理服务器重复该请求。</div><div class="line"><span class="number">300</span> - <span class="keyword">Multiple </span>Choices 客户请求的文档可以在多个位置找到，这些位置已经在返回的文档内列出。如果服务器要提出优先选择，则应该在Location应答头指明。 </div><div class="line"><span class="number">301</span> - <span class="keyword">Moved </span>Permanently 客户请求的文档在其他地方，新的URL在Location头中给出，浏览器应该自动地访问新的URL。 </div><div class="line"><span class="number">302</span> - Found 类似于<span class="number">301</span>，但新的URL应该被视为临时性的替代，而不是永久性的。注意，在HTTP1.<span class="number">0</span>中对应的状态信息是“<span class="keyword">Moved </span>Temporatily”。出现该状态代码时，浏览器能够自动访问新的URL，因此它是一个很有用的状态代码。注意这个状态代码有时候可以和<span class="number">301</span>替换使用。例如，如果浏览器错误地请求http://host/~user （缺少了后面的斜杠），有的服务器返回<span class="number">301</span>，有的则返回<span class="number">302</span>。严格地说，我们只能假定只有当原来的请求是<span class="meta">GET</span>时浏览器才会自动重定向。请参见<span class="number">307</span>。 </div><div class="line"><span class="number">303</span> - See Other 类似于<span class="number">301</span>/<span class="number">302</span>，不同之处在于，如果原来的请求是POST，Location头指定的重定向目标文档应该通过<span class="meta">GET</span>提取（HTTP <span class="number">1</span>.<span class="number">1</span>新）。     </div><div class="line"><span class="number">304</span> - Not Modified 客户端有缓冲的文档并发出了一个条件性的请求（一般是提供<span class="meta">If</span>-Modified-Since头表示客户只想比指定日期更新的文档）。服务器告诉客户，原来缓冲的文档还可以继续使用。</div><div class="line"><span class="number">305</span> - Use Proxy 客户请求的文档应该通过Location头所指明的代理服务器提取（HTTP <span class="number">1</span>.<span class="number">1</span>新）。 </div><div class="line"><span class="number">307</span> - Temporary Redirect 和<span class="number">302</span>（Found）相同。许多浏览器会错误地响应<span class="number">302</span>应答进行重定向，即使原来的请求是POST，即使它实际上只能在POST请求的应答是<span class="number">303</span>时才能重定向。由于这个原因，HTTP <span class="number">1</span>.<span class="number">1</span>新增了<span class="number">307</span>，以便更加清除地区分几个状态代码：当出现<span class="number">303</span>应答时，浏览器可以跟随重定向的<span class="meta">GET</span>和POST请求；如果是<span class="number">307</span>应答，则浏览器只能跟随对<span class="meta">GET</span>请求的重定向。（HTTP <span class="number">1</span>.<span class="number">1</span>新）</div></pre></td></tr></table></figure>
<h2 id="4xx-客户端错误"><a href="#4xx-客户端错误" class="headerlink" title="4xx - 客户端错误"></a>4xx - 客户端错误</h2><figure class="highlight lsl"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div></pre></td><td class="code"><pre><div class="line">发生错误，客户端似乎有问题。例如，客户端请求不存在的页面，客户端未提供有效的身份验证信息。</div><div class="line"></div><div class="line"><span class="number">400</span> - Bad Request 请求出现语法错误。     </div><div class="line"><span class="number">401</span> - Unauthorized 访问被拒绝，客户试图未经授权访问受密码保护的页面。应答中会包含一个WWW-Authenticate头，浏览器据此显示用户名字/密码对话框，然后在填写合适的Authorization头后再次发出请求。IIS 定义了许多不同的 <span class="number">401</span> 错误，它们指明更为具体的错误原因。这些具体的错误代码在浏览器中显示，但不在 IIS 日志中显示：</div><div class="line"></div><div class="line"><span class="number">401.1</span> - 登录失败。</div><div class="line"><span class="number">401.2</span> - 服务器配置导致登录失败。</div><div class="line"><span class="number">401.3</span> - 由于 ACL 对资源的限制而未获得授权。</div><div class="line"><span class="number">401.4</span> - 筛选器授权失败。</div><div class="line"><span class="number">401.5</span> - ISAPI/CGI 应用程序授权失败。</div><div class="line"><span class="number">401.7</span> – 访问被 Web 服务器上的 URL 授权策略拒绝。这个错误代码为 IIS <span class="number">6.0</span> 所专用。</div><div class="line"><span class="number">403</span> - Forbidden 资源不可用。服务器理解客户的请求，但拒绝处理它。通常由于服务器上文件或目录的权限设置导致。</div><div class="line">禁止访问：IIS 定义了许多不同的 <span class="number">403</span> 错误，它们指明更为具体的错误原因：</div><div class="line"></div><div class="line"><span class="number">403.1</span> - 执行访问被禁止。</div><div class="line"><span class="number">403.2</span> - 读访问被禁止。</div><div class="line"><span class="number">403.3</span> - 写访问被禁止。</div><div class="line"><span class="number">403.4</span> - 要求 SSL。</div><div class="line"><span class="number">403.5</span> - 要求 SSL <span class="number">128</span>。</div><div class="line"><span class="number">403.6</span> - IP 地址被拒绝。</div><div class="line"><span class="number">403.7</span> - 要求客户端证书。</div><div class="line"><span class="number">403.8</span> - 站点访问被拒绝。</div><div class="line"><span class="number">403.9</span> - 用户数过多。</div><div class="line"><span class="number">403.10</span> - 配置无效。</div><div class="line"><span class="number">403.11</span> - 密码更改。</div><div class="line"><span class="number">403.12</span> - 拒绝访问映射表。</div><div class="line"><span class="number">403.13</span> - 客户端证书被吊销。</div><div class="line"><span class="number">403.14</span> - 拒绝目录列表。</div><div class="line"><span class="number">403.15</span> - 超出客户端访问许可。</div><div class="line"><span class="number">403.16</span> - 客户端证书不受信任或无效。</div><div class="line"><span class="number">403.17</span> - 客户端证书已过期或尚未生效。</div><div class="line"><span class="number">403.18</span> - 在当前的应用程序池中不能执行所请求的 URL。这个错误代码为 IIS <span class="number">6.0</span> 所专用。</div><div class="line"><span class="number">403.19</span> - 不能为这个应用程序池中的客户端执行 CGI。这个错误代码为 IIS <span class="number">6.0</span> 所专用。</div><div class="line"><span class="number">403.20</span> - Passport 登录失败。这个错误代码为 IIS <span class="number">6.0</span> 所专用。</div><div class="line"></div><div class="line"><span class="number">404</span> - Not Found 无法找到指定位置的资源。这也是一个常用的应答。</div><div class="line"></div><div class="line"><span class="number">404.0</span> -（无） – 没有找到文件或目录。</div><div class="line"><span class="number">404.1</span> - 无法在所请求的端口上访问 Web 站点。</div><div class="line"><span class="number">404.2</span> - Web 服务扩展锁定策略阻止本请求。</div><div class="line"><span class="number">404.3</span> - MIME 映射策略阻止本请求。</div><div class="line"><span class="number">405</span> - Method Not Allowed 请求方法（GET、POST、HEAD、DELETE、PUT、TRACE等）对指定的资源不适用，用来访问本页面的 HTTP 谓词不被允许（方法不被允许）（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">406</span> - Not Acceptable 指定的资源已经找到，但它的MIME类型和客户在Accpet头中所指定的不兼容，客户端浏览器不接受所请求页面的 MIME 类型（HTTP <span class="number">1.1</span>新）。 </div><div class="line"><span class="number">407</span> - Proxy Authentication Required 要求进行代理身份验证，类似于<span class="number">401</span>，表示客户必须先经过代理服务器的授权。（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">408</span> - Request Timeout 在服务器许可的等待时间内，客户一直没有发出任何请求。客户可以在以后重</div><div class="line"></div><div class="line">复同一请求。（HTTP <span class="number">1.1</span>新）</div><div class="line"><span class="number">409</span> - Conflict 通常和PUT请求有关。由于请求和资源的当前状态相冲突，因此请求不能成功。（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">410</span> - Gone 所请求的文档已经不再可用，而且服务器不知道应该重定向到哪一个地址。它和<span class="number">404</span>的不同在于，返回<span class="number">407</span>表示文档永久地离开了指定的位置，而<span class="number">404</span>表示由于未知的原因文档不可用。（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">411</span> - Length Required 服务器不能处理请求，除非客户发送一个Content-Length头。（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">412</span> - Precondition Failed 请求头中指定的一些前提条件失败（HTTP <span class="number">1.1</span>新）。</div><div class="line"><span class="number">413</span> – Request Entity Too Large 目标文档的大小超过服务器当前愿意处理的大小。如果服务器认为</div><div class="line"></div><div class="line">自己能够稍后再处理该请求，则应该提供一个Retry-After头（HTTP <span class="number">1.1</span>新）。 </div><div class="line"><span class="number">414</span> - Request URI Too Long URI太长（HTTP <span class="number">1.1</span>新）。 </div><div class="line"><span class="number">415</span> – 不支持的媒体类型。</div><div class="line"><span class="number">416</span> – Requested Range Not Satisfiable 服务器不能满足客户在请求中指定的Range头。（HTTP <span class="number">1.1</span>新） </div><div class="line"><span class="number">417</span> – 执行失败。</div><div class="line"><span class="number">423</span> – 锁定的错误。</div></pre></td></tr></table></figure>
<h2 id="5xx-服务器错误"><a href="#5xx-服务器错误" class="headerlink" title="5xx - 服务器错误"></a>5xx - 服务器错误</h2><figure class="highlight routeros"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div></pre></td><td class="code"><pre><div class="line">服务器由于遇到错误而不能完成该请求。</div><div class="line"></div><div class="line">500 - Internal<span class="built_in"> Server </span><span class="builtin-name">Error</span> 服务器遇到了意料不到的情况，不能完成客户的请求。 </div><div class="line"></div><div class="line">500.12 - 应用程序正忙于在 Web 服务器上重新启动。</div><div class="line">500.13 - Web 服务器太忙。</div><div class="line">500.15 - 不允许直接请求 Global.asa。</div><div class="line">500.16 – UNC 授权凭据不正确。这个错误代码为 IIS 6.0 所专用。</div><div class="line">500.18 – URL 授权存储不能打开。这个错误代码为 IIS 6.0 所专用。</div><div class="line">500.100 - 内部 ASP 错误。</div><div class="line"></div><div class="line">501 - <span class="keyword">Not</span> Implemented 服务器不支持实现请求所需要的功能，页眉值指定了未实现的配置。例如，客户发出了一个服务器不支持的PUT请求。</div><div class="line"></div><div class="line">502 - Bad Gateway 服务器作为网关或者代理时，为了完成请求访问下一个服务器，但该服务器返回了非法的应答。 亦说Web 服务器用作网关或代理服务器时收到了无效响应。</div><div class="line"></div><div class="line">502.1 - CGI 应用程序超时。</div><div class="line">502.2 - CGI 应用程序出错。</div><div class="line"></div><div class="line">503 -<span class="built_in"> Service </span>Unavailable 服务不可用，服务器由于维护或者负载过重未能应答。例如，Servlet可能</div><div class="line"></div><div class="line">在数据库连接池已满的情况下返回503。服务器返回503时可以提供一个Retry-After头。这个错误代码为IIS 6.0 所专用。</div><div class="line"></div><div class="line">504 - Gateway Timeout 网关超时，由作为代理或网关的服务器使用，表示不能及时地从远程服务器获得应答。（HTTP 1.1新） 。</div><div class="line"></div><div class="line">505 - HTTP Version <span class="keyword">Not</span> Supported 服务器不支持请求中所指明的HTTP版本。（HTTP 1.1新）。</div></pre></td></tr></table></figure>
      
      
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        <p><span>发布时间:</span>2016年01月19日 - 13时58分</p>
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